Which part of the plant takes in carbon dioxide from the air for photosynthesis?

1

(a)

Root hair

(b)

Stomata

(c)

Leaf veins

(d)

Sepals

Silkworm is called:

1

(a)

Adult silk moth

(b)

Female silk moth

(c)

Caterpillar

(d)

Pupa

The climate found in Kerala is:

1

(a)

Very hot and wet

(b)

Wet

(c)

Hot and dry

(d)

Moderately hot and dry

Which one of the following places is unlikely to be affected by a cyclone?

1

(a)

Chennai

(b)

Mangaluru (Mangalore)

(c)

Amritsar

(d)

Puri

Manure is added into the soil to increase its

1

(a)

water holding capacity

(b)

to increase size of soil particle

(c)

to make soil well aerated

(d)

to drain water from it

Spiracles on the body of insect are connected to a network of thin air tubes called

1

(a)

lungs

(b)

tracheae

(c)

gills

(d)

blow holes

They are pipe-like consisting of a group of specialised cells. They transport substances and form a two-way traffic in plants. Which of the following terms qualifies for the features mentioned above?

1

(a)

Xylem tissue

(b)

Vascular tissue

(c)

Root hairs

(d)

Phloem tissue

A car moves with a speed of 40 km/h for 15 min and then with a speed of 60 km/h for the next 15 min. The total distance covered by the car is

1

(a)

100 km

(b)

25 km

(c)

15 km

(d)

10 km

Image formed by a plane mirror is always:

1

(a)

Virtual, erect

(b)

Real, erect

(c)

Virtual, inverted

(d)

Real, inverted

Microorganisms act upon the dead plants to produce

1

(a)

sand

(b)

mushroom

(c)

humus

(d)

wood

Green plants are called _____________ since they synthesise their own food.

1

(a)

_____ and _____ fibres are obtained from animals.

1

(a)

Silk, wool

Winds carrying ______ cause rain.

1

(a)

Water

Light is a form of _______.

1

(a)

Energy

The scarcity of water brings condition of _________.

1

(a)

Drought

Ruminant can digest cellulose (carbohydrate).

1

(a) False

(b) True

When a candle burns, both physical and chemical changes take place.

1

(a) False

(b) True

Exhaled air has more percentage of CO₂ than inhaled air.

1

(a) False

(b) True

The smallest time interval that can be measured with commonly available clocks and watches is one second.

1

(a) False

(b) True

Used water is wastewater.

1

(a) False

(b) True

Can plants use nitrogen in the manner they use carbon dioxide?

1

(a)

The plants can not use nitrogen in the manner they use carbon dioxide. They need N₂ in soluble form.

Why do we wear woollen clothes during winter?

1

(a)

The wool is a poor conductor of heat. So, woollen cloths keeps us warm during winter.

Do you see any droplet of water there?

1

(a)

Yes, droplets of water appear there.

Do fishes and butterflies also migrate like birds?

1

(a)

Yes

Does this activity indicate that warm air rises up?

1

(a)

Yes.

I wonder why I found some pieces of plastic articles and polythene bags in the soil samples collected from the roadside and the garden.

1

(a)

It is because people throw used plastic articles and polythene bags in the soil.

Do you see the heart and the blood vessels?

1

(a)

No, we have seen these only in the picture.

What kind of image is formed by a convex mirror?

1

(a)

The image formed by convex mirror is always virtual, erect and diminished in size.

What is the percentage of water on earth is available for use by human?

1

(a)

0.006%.

Why are open drains a concern?

1

(a)

It is so because they create unsanitary and unhygienic conditions.

What is a food pipe? Write its functions.

2

(a)

Why is horse dung mixed in soil which is used for making matkas and surahis?

2

(a)

What are the harmful effect of releasing untreated sewage in water bodies?

2

(a)

1. How does breathing rate vary during heavy exercise?

   2

   (a)

2. Explain why are concave and convex mirrors called spherical mirrors.

   2

   (a)

1. When a candle burns, both physical and chemical changes occur. Explain.

   3

   (a)

2. Give one function of each of the following organs.
   (a) Blood vessels
   (b) Kidney
   (c) Blood platelets
   (d) Heart.

   3

   (a)

Alimentary canal is different from digestive system. Comment.

3

(a)

Boojho made an electromagnet by winding 50 turns of wire over an iron screw. Paheli also made an electromagnet by winding 100 turns over a similar iron screw. Which electromagnet will attract more pins? Give reason.

3

(a)

Why should we worry about the conditions and issues related to forest far from us?

3

(a)

On last Monday, Pankaj was dealing immense cough and cold. Besides this, he was suffering from a great headache. So, he decided to take a leave on that day so that he could take some rest at his home. After one hour he thought to check his fever through a clinical thermometer, so before using it, he washed it and started shaking it very fastly in his hand, so that the mercury level of thermometer gets reduced. At the same time, his elder brother Vishwas scold him and suggested him to shake thet hermometer slowly.
(a) State some precautionary measures while checking the fever through a clinical thermometer.
(b) Mention the values showed by the elder brother of Pankaj ( i.e. Vishwas).

5

(a)

1. Continuously water-logged soils are disadvantages for plant growth. Why?

   5

   (a)

2. Explain the respiration in plants

   5

   (a)

1. It was observed that when the distance between an object and a lens decreases, the size of the image increases. What is the nature of this lens? If you keep on decreasing the distance between the object and the lens, will you still able to obtain the image on the screen? Explain

   5

   (a)

2. State four reasons, why we must preserve forest.

   5

   (a)